private static void MergeReplicationHistories(string documentId, RavenJObject origin, RavenJObject external, ref RavenJObject result)
{
result = (RavenJObject)origin.CloneToken();
RavenJToken originHistory;
RavenJToken externalHisotry;
var originHasHistory = origin.TryGetValue(Constants.RavenReplicationHistory, out originHistory);
var externalHasHistory = external.TryGetValue(Constants.RavenReplicationHistory, out externalHisotry);
RavenJToken externalVersion;
RavenJToken externalSource;
//we are going to lose the external source and version if we don't add them here
if (external.TryGetValue(Constants.RavenReplicationVersion, out externalVersion) &&
external.TryGetValue(Constants.RavenReplicationSource, out externalSource))
{
if (externalHasHistory)
{
externalHisotry = externalHisotry.CloneToken();
}
else
{
externalHisotry = new RavenJArray();
}
var historyEntry = new RavenJObject();
historyEntry[Constants.RavenReplicationVersion] = externalVersion;
historyEntry[Constants.RavenReplicationSource] = externalSource;
((RavenJArray)externalHisotry).Add(historyEntry);
externalHasHistory = true;
}
RavenJArray mergedHistory = null;
//need to merge histories
if (originHasHistory)
{
mergedHistory = Historian.MergeReplicationHistories((RavenJArray)originHistory, (RavenJArray)externalHisotry, documentId);
result[Constants.RavenReplicationMergedHistory] = true;
}
else if (externalHasHistory)
{
//this might be a snapshot if somehow there was an history but no version or source
mergedHistory = (RavenJArray)(externalHisotry.IsSnapshot? externalHisotry.CloneToken(): externalHisotry);
}
//if the original has history and the external didn't we already cloned it.
if (mergedHistory != null)
{
result[Constants.RavenReplicationHistory] = mergedHistory;
}
}
private void ReplicateDelete(string id, RavenJObject newMetadata, TExternal incoming)
{
TInternal existingItem;
Etag existingEtag;
bool deleted;
var existingMetadata = TryGetExisting(id, out existingItem, out existingEtag, out deleted);
if (existingMetadata == null)
{
if (log.IsDebugEnabled)
{
log.Debug("Replicating deleted item {0} from {1} that does not exist, ignoring.", id, Src);
}
return;
}
if (existingMetadata.ContainsKey(Constants.RavenEntityName))
{
newMetadata[Constants.RavenEntityName] = existingMetadata[Constants.RavenEntityName];
}
RavenJObject currentReplicationEntry = null;
if (newMetadata.ContainsKey(Constants.RavenReplicationVersion) &&
newMetadata.ContainsKey(Constants.RavenReplicationSource))
{
currentReplicationEntry = new RavenJObject
{
{ Constants.RavenReplicationVersion, newMetadata[Constants.RavenReplicationVersion] },
{ Constants.RavenReplicationSource, newMetadata[Constants.RavenReplicationSource] }
};
}
var existingHistory = ReplicationData.GetOrCreateHistory(existingMetadata);
if (currentReplicationEntry != null &&
existingHistory.Any(x => RavenJTokenEqualityComparer.Default.Equals(
((RavenJObject)x)[Constants.RavenReplicationSource], currentReplicationEntry[Constants.RavenReplicationSource]) &&
((RavenJObject)x)[Constants.RavenReplicationVersion].Value <long>() >= currentReplicationEntry[Constants.RavenReplicationVersion].Value <long>()))
{
if (log.IsDebugEnabled)
{
log.Debug("Replicated delete for {0} already exist in item history, ignoring", id);
}
return;
}
if (existingMetadata.Value <bool>(Constants.RavenDeleteMarker)) //deleted locally as well
{
if (log.IsDebugEnabled)
{
log.Debug("Replicating deleted item {0} from {1} that was deleted locally. Merging histories.", id, Src);
}
var newHistory = ReplicationData.GetOrCreateHistory(newMetadata);
if (currentReplicationEntry != null)
{
newHistory.Add(currentReplicationEntry);
}
//Merge histories
ReplicationData.SetHistory(newMetadata, Historian.MergeReplicationHistories(newHistory, existingHistory, id));
newMetadata[Constants.RavenReplicationMergedHistory] = true;
MarkAsDeleted(id, newMetadata);
return;
}
if (Historian.IsDirectChildOfCurrent(newMetadata, existingMetadata)) // not modified
{
if (log.IsDebugEnabled)
{
log.Debug("Delete of existing item {0} was replicated successfully from {1}", id, Src);
}
DeleteItem(id, existingEtag);
MarkAsDeleted(id, newMetadata);
return;
}
CreatedConflict createdConflict;
if (existingMetadata.Value <bool>(Constants.RavenReplicationConflict)) // locally conflicted
{
if (log.IsDebugEnabled)
{
log.Debug("Replicating deleted item {0} from {1} that is already conflicted, adding to conflicts.", id, Src);
}
var savedConflictedItemId = SaveConflictedItem(id, newMetadata, incoming, existingEtag);
createdConflict = AppendToCurrentItemConflicts(id, savedConflictedItemId, existingMetadata, existingItem);
}
else
{
RavenJObject resolvedMetadataToSave;
TExternal resolvedItemToSave;
if (TryResolveConflict(id, newMetadata, incoming, existingItem, out resolvedMetadataToSave, out resolvedItemToSave))
{
if (resolvedMetadataToSave.ContainsKey("Raven-Delete-Marker") &&
resolvedMetadataToSave.Value <bool>("Raven-Delete-Marker"))
{
// the deleted document "wins"
if (newMetadata.ContainsKey(Constants.RavenEntityName))
{
resolvedMetadataToSave[Constants.RavenEntityName] = newMetadata[Constants.RavenEntityName];
}
DeleteItem(id, null);
MarkAsDeleted(id, resolvedMetadataToSave);
}
else
{
var etag = deleted == false ? existingEtag : null;
AddWithoutConflict(id, etag, resolvedMetadataToSave, resolvedItemToSave);
}
return;
}
var newConflictId = SaveConflictedItem(id, newMetadata, incoming, existingEtag);
if (log.IsDebugEnabled)
{
log.Debug("Existing item {0} is in conflict with replicated delete from {1}, marking item as conflicted", id, Src);
}
// we have a new conflict move the existing doc to a conflict and create a conflict document
var existingDocumentConflictId = id + "/conflicts/" + GetReplicationIdentifierForCurrentDatabase();
createdConflict = CreateConflict(id, newConflictId, existingDocumentConflictId, existingItem, existingMetadata);
}
Database.TransactionalStorage.ExecuteImmediatelyOrRegisterForSynchronization(() =>
Database.Notifications.RaiseNotifications(new ReplicationConflictNotification()
{
Id = id,
Etag = createdConflict.Etag,
Conflicts = createdConflict.ConflictedIds,
ItemType = ReplicationConflictTypes.DocumentReplicationConflict,
OperationType = ReplicationOperationTypes.Delete
}));
}
public bool TryResolveConflict(string id, RavenJObject metadata, RavenJObject document, JsonDocument existingDoc,
Func <string, JsonDocument> getDocument, out RavenJObject metadataToSave,
out RavenJObject documentToSave)
{
var success = TryResolve(id, metadata, document, existingDoc, getDocument, out metadataToSave, out documentToSave);
if (success == false)
{
return(false);
}
var history = ReplicationData.GetHistory(metadata);
var existingHistory = ReplicationData.GetHistory(existingDoc.Metadata);
ReplicationData.SetHistory(metadataToSave, Historian.MergeReplicationHistories(history, existingHistory));
metadataToSave[Constants.RavenReplicationMergedHistory] = true;
// here we make sure that we keep a deleted document deleted, rather than "reviving" it.
var ravenDeleteMarker = existingDoc.Metadata.Value <string>("Raven-Delete-Marker");
bool markerValue;
if (ravenDeleteMarker != null && bool.TryParse(ravenDeleteMarker, out markerValue) && markerValue)
{
existingDoc.Metadata["Raven-Remove-Document-Marker"] = true;
}
var docToSave = documentToSave;
var metaToSave = metadataToSave;
if (log.IsDebugEnabled)
{
log.Debug(() =>
{
var builder = new StringBuilder();
builder.AppendLine(string.Format("Conflict on document with key '{0}' resolved by '{1}'.", id, GetType().Name));
builder.AppendLine(string.Format("Existing document:"));
if (existingDoc != null && existingDoc.DataAsJson != null)
{
builder.AppendLine(existingDoc.DataAsJson.ToString());
}
builder.AppendLine(string.Format("Existing metadata:"));
if (existingDoc != null && existingDoc.Metadata != null)
{
builder.AppendLine(existingDoc.Metadata.ToString());
}
builder.AppendLine(string.Format("Incoming document:"));
if (document != null)
{
builder.AppendLine(document.ToString());
}
builder.AppendLine(string.Format("Incoming metadata:"));
if (metadata != null)
{
builder.AppendLine(metadata.ToString());
}
builder.AppendLine(string.Format("Output document:"));
if (docToSave != null)
{
builder.AppendLine(docToSave.ToString());
}
builder.AppendLine(string.Format("Output metadata:"));
if (metaToSave != null)
{
builder.AppendLine(metaToSave.ToString());
}
return(builder.ToString());
});
}
return(true);
}
